Single component cold pressure fixable encapsulated toner composition

Abstract

Disclosed is an improved single component cold pressure fixable toner composition comprised of a core containing (1) magnetite particles, and a styrene-butadiene-styrene triblock polymer and a polymeric shell material generated by an interfacial polymerization process.

We claim: 
     
       1. An improved single component cold pressure fixable toner composition consisting essentially of a core with from about 25 percent by weight to about 75 percent by weight magnetite particles, and a styrene-butadiene-styrene triblock polymer, encapsulated in a polymeric shell material generated by an interfacial polymerization process, wherein the magnetite is surface treated by a reaction with ammonium stearate. 
     
     
       2. An improved single component cold pressure fixable toner composition consisting essentially of a core with about 50 percent by weight of magnetite particles, and from about 10 percent by weight to about 20 percent by weight of a styrene-butadiene-styrene triblock copolymer; and wherein the magnetite is surface treated with from about 1 to about 5 percent by weight of ammonium stearate, said core being encapsulated in a polymeric shell generated by an interfacial polymerization process. 
     
     
       3. An improved composition in accordance with claim 2 wherein the thickness of the shell is from about 0.01 microns to about 1.0 micron. 
     
     
       4. An improved composition in accordance with claim 2 wherein the shell is a polyamide or a polyurea.